Sodium Hydroxide (Food Grade) (Lye, Caustic Soda) (1 Pound) : Amazon.ca: Health & Personal Care
https://www.amazon.ca/Sodium-Hydroxide-Grade-Caustic-Pound/dp/B0875LR274/ref=asc_df_B0875LR274/?tag=googlemobshop-20&linkCode=df0&hvadid=459095837475&hvpos=&hvnetw=g&hvrand=510756795986597251&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9001522&hvtargid=pla-945810725177&psc=1